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#1 2007-01-08 03:42:50
- Kiran
- Member
- Registered: 2006-11-15
- Posts: 177
following equation
given that 0 degrees <_ x < 360 degrees , solve the following equation :
cos x - sqrt(1 - cos^2 x) = 0
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#2 2007-01-08 04:14:38
- mathsyperson
- Moderator
- Registered: 2005-06-22
- Posts: 4,900
Re: following equation
A basic identity is that sin² x + cos² x = 1.
Therefore, 1 - cos² x = sin² x, and so sqrt(1 - cos² x) = sin x.
So now you have cos x - sin x = 0. And it should be easy after that.
Why did the vector cross the road?
It wanted to be normal.
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